EP2399543A2 - System zur Anpassung der Okklusion - Google Patents
System zur Anpassung der Okklusion Download PDFInfo
- Publication number
- EP2399543A2 EP2399543A2 EP11005211A EP11005211A EP2399543A2 EP 2399543 A2 EP2399543 A2 EP 2399543A2 EP 11005211 A EP11005211 A EP 11005211A EP 11005211 A EP11005211 A EP 11005211A EP 2399543 A2 EP2399543 A2 EP 2399543A2
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- EP
- European Patent Office
- Prior art keywords
- data
- occlusal
- grinding
- dentist
- cutting
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Images
Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C13/00—Dental prostheses; Making same
- A61C13/0024—Repairing or adjusting dentures; Location of irritating zones
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C13/00—Dental prostheses; Making same
- A61C13/0003—Making bridge-work, inlays, implants or the like
- A61C13/0004—Computer-assisted sizing or machining of dental prostheses
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C13/00—Dental prostheses; Making same
- A61C13/0003—Making bridge-work, inlays, implants or the like
- A61C13/0006—Production methods
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C13/00—Dental prostheses; Making same
- A61C13/10—Fastening of artificial teeth to denture palates or the like
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C11/00—Dental articulators, i.e. for simulating movement of the temporo-mandibular joints; Articulation forms or mouldings
-
- G—PHYSICS
- G16—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR SPECIFIC APPLICATION FIELDS
- G16H—HEALTHCARE INFORMATICS, i.e. INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR THE HANDLING OR PROCESSING OF MEDICAL OR HEALTHCARE DATA
- G16H20/00—ICT specially adapted for therapies or health-improving plans, e.g. for handling prescriptions, for steering therapy or for monitoring patient compliance
- G16H20/40—ICT specially adapted for therapies or health-improving plans, e.g. for handling prescriptions, for steering therapy or for monitoring patient compliance relating to mechanical, radiation or invasive therapies, e.g. surgery, laser therapy, dialysis or acupuncture
Definitions
- the present invention relates to a denture occlusal adjustment system in which preparation of dentures in a denture-production process is performed by a dentist or a dental technician and an occlusal adjustment in the process is performed by a special contractor.
- a denture-production process generally includes the steps of preparing wax dentures using artificial teeth and wax; replacing a plate made of wax with acrylic resin for denture plate by a lost-wax process to prepare pre-occlusal adjustment dentures, and subjecting the pre-occlusal adjustment dentures to an occlusal adjustment.
- the pre-occlusal adjustment dentures are attached to an articulator.
- the acrylic resin for denture plate has a property of slightly contracting when being polymerized (hardened) and, in many cases, causes a small increase in height of occlusion. In order to correct this, it is necessary to perform a correction adjustment of the occlusion once again. The occlusion state when the dentures are occluded is confirmed.
- the occlusion surfaces of artificial teeth are adjusted by grinding to allow the artificial teeth to occlude evenly in horizontal direction.
- An articulating paper such as 12-micron carbon paper, is placed between the occluded teeth and the contact portions between the teeth is marked by color. If occlusion is poor, dentures particularly the full dentures are not stable. However, it is not better to properly grind a portion that strongly contact with the opposite portion. It is necessary to grind and adjust the contact portion while a force-exerting direction is considered so that the dentures will be stabilized while being occluded.
- occlusion is adjusted by grinding while harmonious occlusion of front and back teeth is considered.
- occlusion is adjusted by grinding in the style of "full balanced occlusion" where all the teeth can slidably contact with the corresponding teeth even when the jaw are moved in any direction (teach gnashing). Grinding is performed so that the dentures are stably occluded when the jaw is moved in the left direction or in the right direction. Occlusion when the jaw is moved forward is similarly adjusted by grinding. A micro-order fine work is repeated.
- An occlusal adjustment work is a work for grinding an occluded surface.
- the occlusal adjustment work is a work for marking (coloring) contact portions of the upper and lower jaws in the occlusal surface, which is an occluded surface, by using a carbon paper or the like and grinding such portions little by little.
- the articulator reproduces just an average movement of jaws. Therefore, an occlusal adjustment is also based on theoretical average values. However, the occlusal adjustment can be performed within the minimum range in a dental clinic when dentures are actually applied to a patient by correctly adjusting the occlusion to the theoretical average values.
- the present invention relates to a denture occlusal adjustment system in which preparation of dentures itself is performed by a dentist or a dental technician and an occlusal adjustment is performed by a special to shorten an occlusal adjustment work while obtaining correct occlusion.
- a denture occlusal adjustment system includes:
- a denture occlusal adjustment system includes:
- the denture occlusal adjustment system of the first or second aspect further includes:
- the denture occlusal adjustment system of the first or second aspect further includes:
- the denture occlusal adjustment system of the first or second aspect further includes: means for charging for provision of the cutting data on the grinding data provider when the means for transmitting the cutting data transmits the cutting data.
- the denture occlusal adjustment system of the first or second aspect further includes: means for charging for provision of the image data and the cutting data on the grinding data provider side, when the means for transmitting the signal of acceptable or signal of unacceptable transmits a signal of acceptable, or when the means for transmitting the cutting data transmit cutting data.
- the denture occlusal adjustment system further includes:
- the means for acquiring occlusal-surface shape data and occlusal-surface position date further includes, in addition to the occlusal-surface shape data and the occlusal-surface position data, jaw-movement data and reference point data that makes a connection between jaw-movement data and the occlusal-surface shape data.
- the jaw-movement data is preferably setting data of an articulator including condylar distance, distance between upper arch and the lower arch, sagittal condylar path inclination, balancing-side lateral condyle path angle, immediate side shift, angle of the working side lateral condyle path, sagittal incisal path inclination, and lateral incisal path guide angle.
- the denture occlusal adjustment system further includes:
- preparation of dentures itself in a denture-production process is performed by a dentist or a dental technician and an occlusal adjustment in the process is performed by a special contractor.
- a dentist or a dental technician and an occlusal adjustment in the process is performed by a special contractor.
- Data is delivered and received on a network.
- grinding data can be confirmed without large influence of system requirements of a client PC on the dentist side.
- a new grinding system can be obtained freely. Since calculation of occlusal adjustment data is performed on the grinding-data provider, load on the client PC on the dentist side can be reduced. By requesting occlusal adjustment information from an outside grinding-data provider, it is possible to charge for every denture, and an initial investment on the dentist side can be reduced.
- the dentist side which is a user, can be prevented from needless charging. Since the state after the occlusal adjustment can be virtually confirmed and the state after the occlusal adjustment can be confirmed in detail on a screen, the configuration of the articulator can be reconfigured. Since the cross-section and extended state of the occlusal surface can be confirmed before the occlusal adjustment, the occlusal adjustment can be prevented from failing.
- a slight displacement of the inter-cuspal position produced when equipped in a buccal cavity can be deminished.
- the more optimal occlusal relationship can be reproduced.
- a maxillomandibular occlusal state can be obtained without load to a patient.
- the prosthesis has been made by using a jaw model of one jaw.
- an occlusal adjustment may be performed to prepare better denture.
- it has been also necessary to create the jaw model of the opposite side and such a jaw-model production work has been needed. Thus, it has been skipped.
- the occlusal adjustment was one using a carbon paper and has not been easily performed. Thus, it has been intended to be avoided.
- the production of a jaw model for a prosthetic portion is necessary; however, there is no need of preparing an opposite jaw model.
- the form of an occlusal surface of a portion, where prosthesis is formed, and the form of the opposite occlusal surface are molded in a silicone mold using a "silicone tray with reference point (illustrated in the figure). Impressions and reference points are read by a common scanner and provided as "data representing a positional relationship between upper and lower jaws" for performing the occlusal adjustment.
- the occlusal surface of a portion, where the silicone-molded prosthesis is formed is prepared. Then the prosthesis is prepared and read with the scanner to give "prosthesis data”. Then, grinding data can be calculated based on the above “data representing a positional relationship between upper and lower jaws" and "prosthesis data”.
- the third aspect of the present invention it is possible to confirm whether dentures are ground by CAM according to CAM data.
- a dentist and a grinding-data provider can confirm whether the grinding of dentures is performed correctly.
- the grinding-data provider clearly recognizes the state of confirming by the dentist.
- the grinding-data provider also clearly recognizes the states before and after the grinding by using image data after the actual grinding. If the grinding is performed wrong, a warning can be given.
- the image data (including 3D-data) before and after grinding may be advantageously used for informed consent to a patient.
- a patient's occlusal state can be left on record and can be used as important data when the optimal denture for the patient is prepared.
- the amount of data to be transmitted and received between the dentist side (dentist or dental technician) and the grinding-data provider can be reduced. Furthermore, the amount of data of the required portions to be stored can be reduced. Thus, data management can be facilitated.
- a typical process for producing a denture is as follows:
- the intraoral form is taken, the wax rim is formed, the artificial teeth are arranged, and the wax is replaced with the resin by a lost-wax process.
- the contraction of the resin causes a positional displacement of artificial teeth and interference occurs when the artificial teeth are bitten as dentures by the upper and lower jaws.
- the grinding is the adjustment of such an interference portion. Even if the occlusion is correctly performed on the dentures, the grinding may be performed to change the occlusal relationship depending on the status of the buccal cavity of the patient. The adjustment is performed in corporation with the movement of the jaws of the patient. According to the present invention, a series of these operations is performed using a program.
- full dentures are preferable.
- partial dentures may be also used even in the case where the upper and lower jaws are a combination of dentures.
- the denture-grinding method of the present invention includes the following processes as illustrated in Fig. 1 .
- the movement direction is a direction along which the maxillary orthogonal coordinate system moves with respect to the mandibular orthogonal coordinate system at an arbitrary point within the range surrounded by the maxillary 3D-data and the mandibular 3D-data in the dynamic relation represented by the occlusion-state reproduction step.
- the movement direction is preferably linear.
- the movement direction may be curved.
- the movement direction may be approximate to a straight line.
- a curved line may be applied to the movement direction.
- the movement direction is a straight line or a curved surface. Preferably, it is a straight line or cylindrical surface.
- the arbitrary point in range A surrounded by the maxillary 3D-data 8 and mandibular 3D-data 9 is the center of gravity G of the range surrounded by maxillary 3D-data 8 and the mandibular 3D-data 9.
- the center of gravity G is preferably calculated as X', Y', Z' obtained by converting X, Y, and Z axis of a mandibular orthogonal coordinate system and X, Y, and Z axis of a maxillary orthogonal coordinate system XYZ axis into those of the same orthogonal coordinate system, respectively, and dividing the sums of the values of the respective axes X, Y, and Z are divided by n.
- the grinding surface S is a plane including the movement direction of the upper jaw with respect to the lower jaw that passes through the values of X', Y', and Z'. This movement direction is calculated by the reproduction method represented in the occlusion-state reproduction step.
- these adjustment mechanisms can be reproduced on the computer in the case of an arcon type articulator or a condylar type articulator.
- the arcon type articulator is preferable.
- the condylar distance of the articulator is 50 to 170 mm, preferably 80 to 140 mm, more preferably 100 to 120 mm. It is preferred to have an average condylar distance as a fixed value of 110 mm.
- a distance between the upper arch and the lower arch is about 80 to 120 mm. Any distance between the upper arch and the lower arch is allowable as long as it is determined where appropriate.
- the condylar distance and the distance between the upper arch and the lower arch are calculated from numerical values previously defined by the condyle path regulatory mechanism and the incisal patch regulatory mechanism, which specify the maxillomandibular movement of the articulator.
- the condyle path regulatory mechanism include an inclination of sagittal condylar path, a balancing-side lateral condyle path, a regulatory mechanism for immediate side-shift, and a regulatory mechanism for an angle of lateral condyle path on the working side.
- incisal path regulatory mechanism examples include a sagittal incisal path inclination and a lateral incisal path guide angle.
- An inclination of sagittal condylar path is -30 degrees to +90 degrees, preferably -0 degree to +50 degrees, more preferably -20 degrees to +80 degrees.
- a balancing-side lateral condyle path is 0 degrees to +40 degrees, preferably +10 degrees to +20 degrees, more preferably 0 degree to +30 degrees.
- a regulatory mechanism for immediate side-shift is 0 to 5 mm, preferably 0 to 8 mm, more preferably 0 to 10 mm.
- a regulatory mechanism for an angle of lateral condyle path on the working side is -50 degrees to +60 degrees, preferably -40 degrees to +50 degrees, more preferably -30 degrees to +30 degrees.
- a sagittal incisal path inclination is -30 degrees to +90 degrees, preferably -20 degrees to +80 degrees, more preferably -10 degrees to +75 degrees.
- a lateral incisal path guide angle is -0 degree to +90 degrees, preferably -0 degrees to +50 degrees.
- the maxillary orthogonal coordinate system is calculated with respect to the mandibular orthogonal coordinate system, which can move in accordance with these regulation mechanisms. From the names or the like of commercial articulators, settings which can appropriately select only adjustment items are preferable.
- the fixed values of the articulator are fixedly entered without change when the name of this articulator is selected.
- the defined conditions are conditions being set to remove protruded portions to prevent upper and lower jaws from being caught while allowing them smoothly rubbing with each other.
- the grinding data obtained in the present step is used as CAD data for grinding dentures.
- An NC program for processing in the grinding step for pre-grinding dentures is prepared.
- a computer numerical control (CNC) which controls a moving distance, a moving speed, and so on of tools in machine work by a computer, is used for grinding dentures. This process is referred to as CAM.
- Fig. 6 is a diagram illustrating faces to be ground in occlusal surfaces. Grinding is performed substantially in a bilaterally-symmetric manner.
- lead lines 1, 2, and 3 represent only one of jaws, respectively.
- occlusal facets where the upper and lower jaws make contact with each other, come into surface contact with the corresponding ones.
- the occlusal facets become surfaces being rubbed in accordance with the movement of the jaws.
- Lead line 1 denotes posterior occlusal facets
- lead line 2 denotes protrusive occlusal facets
- lead line 3 denotes balancing occlusal facets.
- reference numeral 1 denotes each of the surface portions to be ground at a certain angle
- 2 denotes each of the surface portions to be ground at another angle
- 3 denotes the surface portions to be ground at a still another angle.
- these surfaces represented by these reference numerals are illustrative only. When considering occlusal static or dynamic relation, it is preferable to adjust or calculate the angles of the respective surfaces so that the surfaces are rubbed with the corresponding surfaces in their correct directions. Alternatively, however, these surface portions may be those to be ground almost at the same angle.
- Fig. 7 is a schematic diagram illustrating the configuration of a denture occlusal adjustment system according to an embodiment of the present invention.
- a personal computer (hereinafter, simply referred to as a computer) 11 on a dentist side can be connected to a personal computer (hereinafter simply referred to as a computer) 12 on a data center side of a grinding-data provider through Internet 13.
- the dentist side prepares patient's dentures.
- the center side is a vendor (provider) who offers cutting data of an occlusal adjustment portion in accordance with occlusal-surface shape data and occlusal-surface data from the dentist side.
- the computer 11 On the dentist side, the computer 11 is connected to a three-dimensional form measuring apparatus 14, a CAD/CAM system 15, and a denture grinding machine 16.
- the CAD/CAM system 15 creates a NC program for occlusal adjustment and grinding based on shape data created by CAD.
- the denture grinding machine 16 cuts a denture according to the NC program, and performs occlusal adjustment and grinding.
- the computer 12 On the center side, the computer 12 is connected to the CAD system 17.
- Fig. 8 illustrates the operation of an occlusal adjustment system according to a first embodiment.
- the occlusal surface of artificial tooth is measured by the three-dimensional form measuring apparatus at the time of occlusal adjustment (step 8) after arranging front tooth and molar tooth on a wax rim in the denture-production step described above.
- the measurement results are incorporated into the computer.
- the CAD/CAM system acquires occlusal-surface shape data and occlusal-surface position data.
- occlusal-surface shape data means data that represents the shape of an occlusal surface.
- an occlusal view emerges from the occlusal surface direction.
- the slope of the pharynx direction is important to the upper jaw.
- the slope of the pharynx direction is important to the maxilla, and the slope of the labial surface direction is important to the lower jaw.
- the data represents data in this direction in great detail. Specifically, a method for acquiring data for the upper jaw in the pharynx direction and the lower jaw in the labial surface direction is desirable when data is obtained.
- occlusal-surface position data means data that represents a position of occlusal-surface shape data in the buccal cavity.
- it may be one representing the relationship between the occlusal-surface shape data and the occlusal-state reproducing apparatus (articulator).
- articulator As long as a relationship between an articulator and a plaster model, which are used in the denture production, is represented, the data of denture base may be used.
- a method for occlusal adjustment of dentures ground in a manner similar to the present method it is preferable to represent a positional relationship with a reference point representing a positional relationship with grinding data.
- Fig. 15 illustrates a data-transmission screen of a computer on the dentist side.
- the data-transmission screen includes a transmission-data selection portion, an articulator selection button, and a transmission button.
- a call of the transmission-data selection portion is clicked, a holder that stores occlusal-surface shape data and occlusal-surface position data for every patient is displayed.
- a "articulator" tab in the articulator selection portion is clicked, as illustrated in Fig. 15 , a button for articulator A and a button for articulator B are displayed and each of them can be selected.
- a changed length of occlusal vertical dimension can be input. If it is not stated, the change length of occlusal vertical dimension is set to 0.3 mm.
- setting values sagittal condyle path inclination, balancing side lateral condyle path, regulatory mechanism of immediate side shift, and angle regulatory mechanism of working side lateral condyle path in condyle adjustment mechanism; sagittal incisal path inclination and lateral incisal path guide angle in the incisal path regulatory mechanism; change of occlusal vertical dimension
- setting values sagittal condyle path inclination, balancing side lateral condyle path, regulatory mechanism of immediate side shift, and angle regulatory mechanism of working side lateral condyle path in condyle adjustment mechanism; sagittal incisal path inclination and lateral incisal path guide angle in the incisal path regulatory mechanism; change of occlusal vertical dimension
- One of displayed holders of patient A and patient B is selected.
- a standard articulator is available, either articulator A or articulator B is selected.
- a changed length of occlusal vertical dimension is input as needed.
- the acquired occlusal-surface shape data and occlusal-surface position data are transmitted from the computer of the dentist side to the computer on the center side through the Internet.
- a maxillomandibular occlusal state is reproduced and a maxillomandibular occlusal adjustment portion is determined by a CAD system.
- a portion to be subjected to an occlusal adjustment is determined by using jaw movement data.
- Jaw-movement data uses the set data of the articulator which can follow the articulator in a simple manner.
- maxillomandibular occlusal adjustment portion is determined by changing a maxillomandibular occlusal vertical dimension.
- the occlusal-surface position data are reference points of the articulator, based on individual identification information of a patient (such as ID, medical chart No., address/name, and file No.), the data in the form of jaw-movement data of the patient (such as jaw-movement data, articulator setting data, and articulator movement data, preferably articulator setting data) for every patient and the reference points are used for determining a maxillomandibular occlusal adjustment portion.
- the setting conditions (condylar distance, distance between upper arch and the lower arch, sagittal condylar path inclination, balancing-side lateral condyle path angle, immediate side-shift, angle of working side lateral condyle path, working side sagittal incisal path inclination, and lateral incisal path guide angle) of an articulator from the dentist side are preferably acquired.
- the cutting data including data of the occlusal adjustment portion and occlusal-surface position data is created by a CAD system.
- the cutting data is transmitted to the dentist side from the center side by the computer.
- the display side of the computer on the dentist side displays a fact that cutting data is received.
- an OK button is pressed, as illustrated in FIG. 20 , a holder storing the cutting data (CAM data) is formed at a low rank of the data holder of patient A in the transmission screen.
- CAM data cutting data
- Fig. 9 illustrates operations of an occlusal adjustment system according to a second embodiment.
- image data representing an occlusal adjustment portion is created by a CAD system. Then, the image data is transmitted to the dentist side from the computer. It is preferable that data to be subjected to an occlusal adjustment is found in the image data. It is preferable that the occlusal adjustment portion is classified by color in the occlusal surface. The amount of deletion is preferably represented in terms of volume. It is preferable that the final image data is simultaneously given with work data obtained at the time of occlusal adjustment. It is preferable to save the occlusal-surface shape data for every patient in chronological order.
- Fig. 19 illustrates a confirmation screen of data sent from the center side to the dentist side.
- image data representing an occlusal adjustment portion is displayed.
- slide levers are displayed for performing cut, rotation, movement, and zoom in/out of an image by using a mouse.
- a range specification button that specifies the range of an image and an eraser button that can eliminate the arbitrary portions of an image are displayed on the upper left of image data.
- a slide lever is provided for moving the upper jaw and the lower jaw right-and-left and forward-and-backward and reproducing an occlusal state.
- a cross-sectional image of a portion cut by a cut slide lever is displayed.
- a color-changing portion is provided for changing colors of upper jaw, low jaw, overlapped portion, and grinding portion.
- Upper part of the screen is provided with a confirmation button, a detail change button, an occlusal vertical dimension change button, and an occlusal vertical dimension numerical value input portion.
- the confirmation button is pressed when accepting image data.
- the detail change button is pressed when image data is not accepted and the screen is desired to return to the articulator detailed screen so that the numerical value of the articulator can changed.
- the occlusal vertical dimension change button is pressed when the image data is not accepted and an occlusal vertical dimension is desired to be changed.
- the occlusal vertical dimension numerical value input portion can input the numerical value of an occlusal vertical dimension when the occlusal vertical dimension change button is pressed.
- the dentist side confirms image data received from the center side.
- a signal of acceptable or unacceptable is transmitted by the computer.
- the maxillomandibular occlusal vertical dimension is further changed to determine a maxillomandibular occlusal adjustment portion.
- the image data is transmitted until an acceptance is obtained.
- cutting data including occlusal-surface position data and occlusal-adjustment portion data is created. As described above, cutting data is transmitted from the center side to the dentist side by the computer.
- FIG. 10 illustrates operations of an occlusal adjustment system according to a third embodiment.
- the dentist accepts image data of an occlusal adjustment portion
- charging for offering the image data on the center side is made.
- FIG. 20 illustrates an example in which data screen sent from the center side to the dentist side notifies that the confirmation button is pressed, it is charged when an OK button is pressed, and also notifies the amount of charging and a charging method.
- the charging may be performed when the center side offers cutting data.
- Fig. 11 illustrates operations of an occlusal adjustment system according to a fourth embodiment.
- a change in occlusal vertical dimension and a change in set value of an articulator are notified.
- the values of an occlusal vertical dimension and the set value of the articulator are changed.
- a re-calculation button is placed, the occlusal vertical dimension and the set value of the articulator are sent to the center side.
- the center side determines the maxillomandibular occlusal adjustment portion at the changed occlusal vertical dimension set value and the changed set value of articulator, and it transmits image data until acceptance is acquired.
- impressions in occlusion of the upper and lower jaws are used as data to be transmitted from the dentist side to the center side without the use of occlusal-surface shape data and occlusal-surface position data as described in the first to fourth embodiment.
- maxillary denture and mandibular denture are attached to a patient and then tapped or the like to reduce uncomfortable feeling.
- a tray with poured wax or silicone is placed between the upper and lower jaws of a patient. Then, the patient slowly bites the tray.
- the tray may be in the form of one illustrated in Fig. 22 , so that the shapes of the upper and lower occlusal surfaces can be obtained.
- the tray is designed so that wax or silicone can be placed on the upper and lower sides.
- the tray is gently taken out from the inside of the buccal cavity after waiting hardening of wax or silicone. The taken-out impression represents a correct positional relationship of a patient between the upper and lower jaws.
- the positional relationship between the upper and lower jaws is read by a three-dimensional shape measuring apparatus (3D scanner).
- the 3D scanner needs to acquire the upper and lower jaws relationship clearly.
- a reference point is placed in the tray, the maxillomandibular relationship can be read correctly.
- the configuration of the reference point is not specifically limited. However, it is important that the reference point can be read by a double scanner at the time of obtaining a maxillomandibular occlusal surface.
- the reference point may be three projected spheres which can be read from a double scanner at the time of obtaining maxillomandibular occlusal surface.
- Fig. 12 illustrates operations of an occlusal adjustment system according to a fifth embodiment.
- the 3D dimensional data of acquired impressions (impression data) is transmitted from the computer on the dentist side to the computer on the center side through the Internet.
- a maxillomandibular occlusal state is reproduced by a CAD system according to the impression data received from the dentist side. Then the maxillomandibular occlusal adjustment portion is determined. It is also preferable that an artificial tooth shape is predicted from the impression data and then compared with artificial-tooth 3D data which is previously held to confirm the position of artificial tooth in the pre-grinding denture, and form impression data with artificial tooth 3D data.
- the shape of the occlusal surface is read and reversed by the 3D scanner and can be directly used as occlusal form.
- the number of cusps and an impression of the shape of a wax are acquired.
- the shape data of the artificial tooth used in advance are held.
- the impression of the held artificial tooth-shape data is compared with that of wax in advance.
- the tray where the wax or silicone is poured there is a method for measuring a contact position of the opposing teeth with reference to the impressions remained by contact of the opposing teeth on the wax-coated occlusal surface.
- an occlusal adjustment system is configured to perform grinding with CAD/CAM until it is accepted when correct grinding is performed or not after grinding with CAD/CAM. This method is carried out as a therapeutic intervention in clinical, and needs the confirmation of the medical treatment by a dentist.
- Fig. 13 illustrates an occlusal adjustment confirmation operation according to a sixth embodiment.
- the center side transmits cutting data of an occlusal adjustment portion with occlusal-surface position data
- anticipated post-grinding data is transmitted with CAM data.
- the holder of CAM data and anticipated post-grinding data is created at the low rank of the data holder of patient A in a transmitting screen.
- the occlusal-surface shape data and occlusal-surface position data of occlusion-adjusted dentures are acquired in the dentist side.
- the manner of data acquisition is the same as those of the first embodiment.
- Post-grinding data acquired from the occlusion-adjusted dentures is transmitted from the dentist to the center together with anticipated post-grinding data, as illustrated in Fig. 24 .
- the occlusal-surface shape data and occlusal-surface position data (post-grinding data) of occlusion-adjusted dentures, which have been received from the dentist, are overlapped with cutting data (anticipated post-grinding data) of an occlusal adjustment portion to form confirmation image data (synthetic resin) which is able to confirm whether a portion to be ground is subjected to grinding.
- the combined data is stored in the holder of the transmission screen in the computer on the dentist side.
- examples of an overlapping method for visual confirmation include the followings:
- the center side observes confirmation image data and confirms whether grinding of the grinding-required portion is performed.
- the center side confirms that grinding of the grinding-required portion is finished.
- the center side transmits confirmation image data to the dentist side.
- the confirmation screen used here is the same as one described in the first embodiment illustrated in Fig. 19 .
- the dentist side confirms that there is no problem in the confirmation image data which has been received from the grinding data provider side, and then reports this fact to the center side.
- the center side creates the cutting data of a re-occlusal adjustment portion, and transmits cutting data to the dentist side.
- the dentist side allows a display side to display that cutting data is obtained.
- the dentist side confirms whether a re-occlusal adjustment is necessary based on cutting data.
- the dentist side confirms that there is no need of a re-occlusal adjustment, then the dentist informs the center side that non-necessity of re-occlusal adjustment is confirmed.
- an occlusal adjustment is performed by cutting the dentures by a grinding machine based on the cutting data on the dentist side.
- the re-occlusal adjustment is repeated until grinding of the grinding-required portion is completed.
- Fig. 14 illustrates an operation of confirming an occlusal adjustment according to a seventh embodiment.
- the center side performs confirming whether grinding of the grinding-required portion is carried out, and the dentist side accepts this.
- the center side transmits confirmation image data to the dentist side without confirming whether grinding of the grinding-required portion is carried out, and the dentist side diagnoses whether grinding of the grinding-required portion is finished.
- the center side transmits the created confirmation image data to the dentist side.
- the dentist side diagnoses whether there is no problem in the confirmation image data received from the center side.
- the dentist side reports that the dentist side has concluded no problem in confirmation image data.
- the center side creates cutting data of a re-occlusal adjustment portion and transmits the data to the dentist side.
- the dentist side confirms whether a re-occlusal adjustment is necessary based on cutting data, when the dentist side confirms that there is no need of a re-occlusal adjustment, then the dentist side informs the center side that non-necessity of re-occlusal adjustment is confirmed.
- an occlusal adjustment is performed by cutting the dentures by a grinding machine based on the cutting data on the dentist side.
- the dentist may cut and adjust dentures.
- grinding may be performed in consideration of "color classification of distances from the cutting surface".
- the "color classification of distances from the cutting surface” may indicate the state of a food flow groove exactly, and can expect a digestion function and digestion capability (it can determine whether the dentures are the outstanding dentures). In the case where the food flow groove is absent or too small, digestion is not performed exactly. If too large, digestion efficiency can be worse.
- the relation of suitable dentures can be found by asking a patient about a using state of dentures or questions.
- the size of a grinding surface shows the power of digesting food.
- the size of a grinding surface shows the power of digesting food.
- it when it is too large, it needs a patient's occlusal force.
- it when it is too small, it needs to increase mastication frequency.
- mastication frequency Even if an occlusal view is too large, a patient' s occlusal force is needed, while mastication frequency can be increased if too small.
- the relation of suitable dentures can be found by asking a patient about a using state of dentures or questions.
- an eighth embodiment is a method for performing "transmission of occlusal-surface shape data which is a small amount of data ".
- the dentist side may reduce the size of data as much as possible and then transmit the data to the center side.
- the center side may reduce the size of created data and then send the data to the dentist side.
- the data acquired on the dentist side requires at least "jaw-movement data", "occlusal-surface shape data", and "reference point data which connects jaw-movement data and occlusal-surface shape data”.
- the size of each data is reduced and the data environment sent to the center side is improved.
- the present method can reduce the number of data acquired on the dentist side, so that data acquisition time can be also reduced.
- "jaw-movement data” is considered as articulator data.
- configuration data condylar distance, distance between upper arch and the lower arch, sagittal condylar path inclination, balancing-side lateral condyle path angle, immediate side-shift, angle of working side lateral condyle path, sagittal incisal path inclination, and lateral incisal path guide angle
- the configuration data of the articulator used as a standard is transmitted.
- a jig that represents the positional relationship of artificial teeth on the occlusal surface as illustrated in Fig. 32 .
- the jig may be preferably formed so as to correspond to the shape of the occlusal surface of one tooth.
- the jig may be preferably in the form of a female form of the occlusal surface on which the jig can be adapted.
- the jig does not exceed the maximum elevated portion of artificial tooth. It is not on proximal and distal surfaces of the artificial tooth (because of hitting on the adjacent tooth).
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- Health & Medical Sciences (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Dentistry (AREA)
- Epidemiology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Dental Tools And Instruments Or Auxiliary Dental Instruments (AREA)
- Dental Prosthetics (AREA)
- Processing Or Creating Images (AREA)
- Brushes (AREA)
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JP2012024568A (ja) | 2012-02-09 |
EP2399544A3 (de) | 2013-01-02 |
JP4959854B2 (ja) | 2012-06-27 |
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EP2399544B1 (de) | 2014-06-25 |
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EP2399545B1 (de) | 2014-06-25 |
JP2012081281A (ja) | 2012-04-26 |
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